Four-wheeled motorcycle



FIG. 1 is a top plan view of a four-wheeled motorcycle showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a side perspective view of the right side thereof;

FIG. 4 is a side perspective view of the left side thereof;

FIG. 5 is a back perspective view thereof;

FIG. 6 is an oblique perspective view principally illustrating the right side thereof. 

The ornamental design for a four-wheeled motorcycle, as shown. 